git.sesse.net Git - vlc/blob - modules/demux/vobsub.c

   1 /*****************************************************************************
   2  * subtitle.c: Demux vobsub files.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Derk-Jan Hartman <hartman at videolan dot org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34
  35 #include <sys/types.h>
  36 #include <limits.h>
  37
  38 #include <vlc_demux.h>
  39
  40 #include "ps.h"
  41 #include "vobsub.h"
  42
  43 #define MAX_LINE 8192
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48 static int  Open ( vlc_object_t *p_this );
  49 static void Close( vlc_object_t *p_this );
  50
  51 vlc_module_begin ()
  52     set_description( N_("Vobsub subtitles parser") )
  53     set_category( CAT_INPUT )
  54     set_subcategory( SUBCAT_INPUT_DEMUX )
  55     set_capability( "demux", 1 )
  56
  57     set_callbacks( Open, Close )
  58
  59     add_shortcut( "vobsub", "subtitle" )
  60 vlc_module_end ()
  61
  62 /*****************************************************************************
  63  * Prototypes:
  64  *****************************************************************************/
  65
  66 typedef struct
  67 {
  68     int     i_line_count;
  69     int     i_line;
  70     char    **line;
  71 } text_t;
  72 static int  TextLoad( text_t *, stream_t *s );
  73 static void TextUnload( text_t * );
  74
  75 typedef struct
  76 {
  77     int64_t i_start;
  78     int     i_vobsub_location;
  79 } subtitle_t;
  80
  81 typedef struct
  82 {
  83     es_format_t fmt;
  84     es_out_id_t *p_es;
  85     int         i_track_id;
  86
  87     int         i_current_subtitle;
  88     int         i_subtitles;
  89     subtitle_t  *p_subtitles;
  90
  91     int64_t     i_delay;
  92 } vobsub_track_t;
  93
  94 struct demux_sys_t
  95 {
  96     int64_t     i_next_demux_date;
  97     int64_t     i_length;
  98
  99     text_t      txt;
 100     stream_t    *p_vobsub_stream;
 101
 102     /* all tracks */
 103     int            i_tracks;
 104     vobsub_track_t *track;
 105
 106     int         i_original_frame_width;
 107     int         i_original_frame_height;
 108     bool  b_palette;
 109     uint32_t    palette[16];
 110 };
 111
 112 static int Demux( demux_t * );
 113 static int Control( demux_t *, int, va_list );
 114
 115 static int ParseVobSubIDX( demux_t * );
 116 static int DemuxVobSub( demux_t *, block_t *);
 117
 118 /*****************************************************************************
 119  * Module initializer
 120  *****************************************************************************/
 121 static int Open ( vlc_object_t *p_this )
 122 {
 123     demux_t     *p_demux = (demux_t*)p_this;
 124     demux_sys_t *p_sys;
 125     char *psz_vobname, *s;
 126     int i_len;
 127
 128     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 129     {
 130         if( !strcasestr( s, "# VobSub index file" ) )
 131         {
 132             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 133             free( s );
 134             if( stream_Seek( p_demux->s, 0 ) )
 135             {
 136                 msg_Warn( p_demux, "failed to rewind" );
 137             }
 138             return VLC_EGENERIC;
 139         }
 140         free( s );
 141
 142     }
 143     else
 144     {
 145         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 146         return VLC_EGENERIC;
 147     }
 148
 149     p_demux->pf_demux = Demux;
 150     p_demux->pf_control = Control;
 151     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 152     if( unlikely( !p_sys ) )
 153         return VLC_ENOMEM;
 154     p_sys->i_length = 0;
 155     p_sys->p_vobsub_stream = NULL;
 156     p_sys->i_tracks = 0;
 157     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 158     if( unlikely( !p_sys->track ) )
 159     {
 160         free( p_sys );
 161         return VLC_ENOMEM;
 162     }
 163     p_sys->i_original_frame_width = -1;
 164     p_sys->i_original_frame_height = -1;
 165     p_sys->b_palette = false;
 166     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 167
 168     /* Load the whole file */
 169     TextLoad( &p_sys->txt, p_demux->s );
 170
 171     /* Parse it */
 172     ParseVobSubIDX( p_demux );
 173
 174     /* Unload */
 175     TextUnload( &p_sys->txt );
 176
 177     /* Find the total length of the vobsubs */
 178     if( p_sys->i_tracks > 0 )
 179     {
 180         int i;
 181         for( i = 0; i < p_sys->i_tracks; i++ )
 182         {
 183             if( p_sys->track[i].i_subtitles > 1 )
 184             {
 185                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 186                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 187             }
 188         }
 189     }
 190
 191     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path ) == -1 )
 192     {
 193         free( p_sys );
 194         return VLC_EGENERIC;
 195     }
 196     i_len = strlen( psz_vobname );
 197     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 198
 199     /* open file */
 200     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 201     if( p_sys->p_vobsub_stream == NULL )
 202     {
 203         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 204                  psz_vobname );
 205         free( psz_vobname );
 206         free( p_sys );
 207         return VLC_EGENERIC;
 208     }
 209     free( psz_vobname );
 210
 211     return VLC_SUCCESS;
 212 }
 213
 214 /*****************************************************************************
 215  * Close: Close subtitle demux
 216  *****************************************************************************/
 217 static void Close( vlc_object_t *p_this )
 218 {
 219     int i;
 220     demux_t *p_demux = (demux_t*)p_this;
 221     demux_sys_t *p_sys = p_demux->p_sys;
 222
 223     /* Clean all subs from all tracks */
 224     for( i = 0; i < p_sys->i_tracks; i++ )
 225         free( p_sys->track[i].p_subtitles );
 226
 227     free( p_sys->track );
 228
 229     if( p_sys->p_vobsub_stream )
 230         stream_Delete( p_sys->p_vobsub_stream );
 231
 232     free( p_sys );
 233 }
 234
 235 /*****************************************************************************
 236  * Control:
 237  *****************************************************************************/
 238 static int Control( demux_t *p_demux, int i_query, va_list args )
 239 {
 240     demux_sys_t *p_sys = p_demux->p_sys;
 241     int64_t *pi64, i64;
 242     int i;
 243     double *pf, f;
 244
 245     switch( i_query )
 246     {
 247         case DEMUX_GET_LENGTH:
 248             pi64 = (int64_t*)va_arg( args, int64_t * );
 249             *pi64 = (int64_t) p_sys->i_length;
 250             return VLC_SUCCESS;
 251
 252         case DEMUX_GET_TIME:
 253             pi64 = (int64_t*)va_arg( args, int64_t * );
 254             for( i = 0; i < p_sys->i_tracks; i++ )
 255             {
 256                 bool b_selected;
 257                 /* Check the ES is selected */
 258                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 259                                 p_sys->track[i].p_es, &b_selected );
 260                 if( b_selected ) break;
 261             }
 262             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 263             {
 264                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 265                 return VLC_SUCCESS;
 266             }
 267             return VLC_EGENERIC;
 268
 269         case DEMUX_SET_TIME:
 270             i64 = (int64_t)va_arg( args, int64_t );
 271             for( i = 0; i < p_sys->i_tracks; i++ )
 272             {
 273                 p_sys->track[i].i_current_subtitle = 0;
 274                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 275                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 276                 {
 277                     p_sys->track[i].i_current_subtitle++;
 278                 }
 279
 280                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 281                     return VLC_EGENERIC;
 282             }
 283             return VLC_SUCCESS;
 284
 285         case DEMUX_GET_POSITION:
 286             pf = (double*)va_arg( args, double * );
 287             for( i = 0; i < p_sys->i_tracks; i++ )
 288             {
 289                 bool b_selected;
 290                 /* Check the ES is selected */
 291                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 292                                 p_sys->track[i].p_es, &b_selected );
 293                 if( b_selected ) break;
 294             }
 295             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 296             {
 297                 *pf = 1.0;
 298             }
 299             else if( p_sys->track[i].i_subtitles > 0 )
 300             {
 301                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 302                       (double)p_sys->i_length;
 303             }
 304             else
 305             {
 306                 *pf = 0.0;
 307             }
 308             return VLC_SUCCESS;
 309
 310         case DEMUX_SET_POSITION:
 311             f = (double)va_arg( args, double );
 312             i64 = (int64_t) f * p_sys->i_length;
 313
 314             for( i = 0; i < p_sys->i_tracks; i++ )
 315             {
 316                 p_sys->track[i].i_current_subtitle = 0;
 317                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 318                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 319                 {
 320                     p_sys->track[i].i_current_subtitle++;
 321                 }
 322                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 323                     return VLC_EGENERIC;
 324             }
 325             return VLC_SUCCESS;
 326
 327         case DEMUX_SET_NEXT_DEMUX_TIME:
 328             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 329             return VLC_SUCCESS;
 330
 331         case DEMUX_GET_FPS:
 332         case DEMUX_GET_META:
 333         case DEMUX_GET_TITLE_INFO:
 334         case DEMUX_HAS_UNSUPPORTED_META:
 335         case DEMUX_GET_ATTACHMENTS:
 336         case DEMUX_CAN_RECORD:
 337             return VLC_EGENERIC;
 338
 339         default:
 340             msg_Warn( p_demux, "unknown query in subtitle control" );
 341             return VLC_EGENERIC;
 342     }
 343 }
 344
 345 /*****************************************************************************
 346  * Demux: Send subtitle to decoder
 347  *****************************************************************************/
 348 static int Demux( demux_t *p_demux )
 349 {
 350     demux_sys_t *p_sys = p_demux->p_sys;
 351     int64_t i_maxdate;
 352     int i, i_read;
 353
 354     for( i = 0; i < p_sys->i_tracks; i++ )
 355     {
 356 #define tk p_sys->track[i]
 357         if( tk.i_current_subtitle >= tk.i_subtitles )
 358             continue;
 359
 360         i_maxdate = p_sys->i_next_demux_date;
 361         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 362         {
 363             /* Should not happen */
 364             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 365         }
 366
 367         while( tk.i_current_subtitle < tk.i_subtitles &&
 368                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 369         {
 370             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 371             block_t *p_block;
 372             int i_size = 0;
 373
 374             /* first compute SPU size */
 375             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 376             {
 377                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 378             }
 379             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 380
 381             /* Seek at the right place */
 382             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 383             {
 384                 msg_Warn( p_demux,
 385                           "cannot seek in the VobSub to the correct time %d", i_pos );
 386                 tk.i_current_subtitle++;
 387                 continue;
 388             }
 389
 390             /* allocate a packet */
 391             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 392             {
 393                 tk.i_current_subtitle++;
 394                 continue;
 395             }
 396
 397             /* read data */
 398             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 399             if( i_read <= 6 )
 400             {
 401                 block_Release( p_block );
 402                 tk.i_current_subtitle++;
 403                 continue;
 404             }
 405             p_block->i_buffer = i_read;
 406
 407             /* pts */
 408             p_block->i_pts = VLC_TS_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 409
 410             /* demux this block */
 411             DemuxVobSub( p_demux, p_block );
 412
 413             tk.i_current_subtitle++;
 414         }
 415 #undef tk
 416     }
 417
 418     /* */
 419     p_sys->i_next_demux_date = 0;
 420
 421     return 1;
 422 }
 423
 424 static int TextLoad( text_t *txt, stream_t *s )
 425 {
 426     char **lines = NULL;
 427     size_t n = 0;
 428
 429     /* load the complete file */
 430     for( ;; )
 431     {
 432         char *psz = stream_ReadLine( s );
 433         char **ppsz_new;
 434
 435         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 436             break;
 437
 438         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 439         if( ppsz_new == NULL )
 440         {
 441             free( psz );
 442             break;
 443         }
 444         lines = ppsz_new;
 445         lines[n++] = psz;
 446     }
 447
 448     txt->i_line_count = n;
 449     txt->i_line       = 0;
 450     txt->line         = lines;
 451
 452     return VLC_SUCCESS;
 453 }
 454
 455 static void TextUnload( text_t *txt )
 456 {
 457     int i;
 458
 459     for( i = 0; i < txt->i_line_count; i++ )
 460         free( txt->line[i] );
 461
 462     free( txt->line );
 463     txt->i_line       = 0;
 464     txt->i_line_count = 0;
 465 }
 466
 467 static char *TextGetLine( text_t *txt )
 468 {
 469     if( txt->i_line >= txt->i_line_count )
 470         return( NULL );
 471
 472     return txt->line[txt->i_line++];
 473 }
 474
 475 static int ParseVobSubIDX( demux_t *p_demux )
 476 {
 477     demux_sys_t *p_sys = p_demux->p_sys;
 478     text_t      *txt = &p_sys->txt;
 479     char        *line;
 480     vobsub_track_t *current_tk = NULL;
 481
 482     for( ;; )
 483     {
 484         if( ( line = TextGetLine( txt ) ) == NULL )
 485         {
 486             return( VLC_EGENERIC );
 487         }
 488
 489         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 490         {
 491             continue;
 492         }
 493         else if( !strncmp( "size:", line, 5 ) )
 494         {
 495             /* Store the original size of the video */
 496             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 497                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 498             {
 499                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 500             }
 501             else
 502             {
 503                 msg_Warn( p_demux, "reading original frame size failed" );
 504             }
 505         }
 506         else if( !strncmp( "palette:", line, 8 ) )
 507         {
 508             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 509             {
 510                 p_sys->b_palette = true;
 511                 msg_Dbg( p_demux, "vobsub palette read" );
 512             }
 513             else
 514             {
 515                 msg_Warn( p_demux, "reading original palette failed" );
 516             }
 517         }
 518         else if( !strncmp( "id:", line, 3 ) )
 519         {
 520             char language[3];
 521             int i_track_id;
 522             es_format_t fmt;
 523
 524             /* Lets start a new track */
 525             if( sscanf( line, "id: %2s, index: %d",
 526                         language, &i_track_id ) == 2 )
 527             {
 528                 p_sys->i_tracks++;
 529                 p_sys->track = xrealloc( p_sys->track,
 530                           sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 531                 language[2] = '\0';
 532
 533                 /* Init the track */
 534                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 535                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 536                 current_tk->i_current_subtitle = 0;
 537                 current_tk->i_subtitles = 0;
 538                 current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );;
 539                 current_tk->i_track_id = i_track_id;
 540                 current_tk->i_delay = (int64_t)0;
 541
 542                 es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 543                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 544                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 545                 fmt.psz_language = language;
 546                 if( p_sys->b_palette )
 547                 {
 548                     fmt.subs.spu.palette[0] = 0xBeef;
 549                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 550                 }
 551
 552                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 553                 msg_Dbg( p_demux, "new vobsub track detected" );
 554             }
 555             else
 556             {
 557                 msg_Warn( p_demux, "reading new track failed" );
 558             }
 559         }
 560         else if( !strncmp( line, "timestamp:", 10 ) )
 561         {
 562             /*
 563              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 564              * loc is the hex location of the spu in the .sub file
 565              */
 566             int h, m, s, ms, count, loc = 0;
 567             int i_sign = 1;
 568             int64_t i_start, i_location = 0;
 569
 570             if( p_sys->i_tracks > 0 &&
 571                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 572                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 573             {
 574                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 575                 subtitle_t *current_sub;
 576
 577                 if( line[count-3] == '-' )
 578                 {
 579                     i_sign = -1;
 580                     h = -h;
 581                 }
 582                 i_start = (int64_t) ( h * 3600*1000 +
 583                             m * 60*1000 +
 584                             s * 1000 +
 585                             ms ) * 1000;
 586                 i_location = loc;
 587
 588                 current_tk->i_subtitles++;
 589                 current_tk->p_subtitles =
 590                     xrealloc( current_tk->p_subtitles,
 591                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 592                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 593
 594                 current_sub->i_start = i_start * i_sign;
 595                 current_sub->i_start += current_tk->i_delay;
 596                 current_sub->i_vobsub_location = i_location;
 597             }
 598             else
 599             {
 600                 msg_Warn( p_demux, "reading timestamp failed" );
 601             }
 602         }
 603         else if( !strncasecmp( line, "delay:", 6 ) )
 604         {
 605             /*
 606              * delay: [sign]hh:mm:ss:mss
 607              */
 608             int h, m, s, ms, count = 0;
 609             int i_sign = 1;
 610             int64_t i_gap = 0;
 611
 612             if( p_sys->i_tracks > 0 &&
 613                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 614                         &h, &count, &m, &s, &ms ) >= 4 )
 615             {
 616                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 617                 if( line[count-3] == '-' )
 618                 {
 619                     i_sign = -1;
 620                     h = -h;
 621                 }
 622                 i_gap = (int64_t) ( h * 3600*1000 +
 623                             m * 60*1000 +
 624                             s * 1000 +
 625                             ms ) * 1000;
 626
 627                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 628                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 629                          i_sign, i_gap, current_tk->i_delay );
 630             }
 631             else
 632             {
 633                 msg_Warn( p_demux, "reading delay failed" );
 634             }
 635         }
 636     }
 637     return( 0 );
 638 }
 639
 640 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 641 {
 642     demux_sys_t *p_sys = p_demux->p_sys;
 643     uint8_t     *p = p_bk->p_buffer;
 644     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 645     int i;
 646
 647     while( p + 6 < p_end )
 648     {
 649         int i_size = ps_pkt_size( p, p_end - p );
 650         block_t *p_pkt;
 651         int      i_id;
 652         int      i_spu;
 653
 654         if( i_size <= 0 )
 655             break;
 656
 657         if( i_size > p_end - p )
 658         {
 659             msg_Warn( p_demux, "broken PES size" );
 660             break;
 661         }
 662
 663         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 664         {
 665             msg_Warn( p_demux, "invalid PES" );
 666             break;
 667         }
 668
 669         if( p[3] != 0xbd )
 670         {
 671             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 672             p += i_size;
 673             continue;
 674         }
 675
 676         /* Create a block */
 677         p_pkt = block_New( p_demux, i_size );
 678         memcpy( p_pkt->p_buffer, p, i_size);
 679         p += i_size;
 680
 681         i_id = ps_pkt_id( p_pkt );
 682         if( (i_id&0xffe0) != 0xbd20 ||
 683             ps_pkt_parse_pes( p_pkt, 1 ) )
 684         {
 685             block_Release( p_pkt );
 686             continue;
 687         }
 688         i_spu = i_id&0x1f;
 689         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 690
 691         for( i = 0; i < p_sys->i_tracks; i++ )
 692         {
 693             vobsub_track_t *p_tk = &p_sys->track[i];
 694
 695             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 696             p_pkt->i_length = 0;
 697
 698             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 699             {
 700                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 701                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 702                 break;
 703             }
 704         }
 705         if( i >= p_sys->i_tracks )
 706         {
 707             block_Release( p_pkt );
 708         }
 709     }
 710
 711     return VLC_SUCCESS;
 712 }
 713